arXiv Machine Learning By Jin-Young Kim, So-Yoon Cho, Hyun-Gyoon Kim

One-Sided Quantile Coupling for Flow Matching

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arXiv:2608. 00978v1 Announce Type: new Abstract: Flow Matching trains continuous-time generative models by regressing the velocity field of a probability path between a simple source distribution and a target data distribution.

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arXiv Machine Learning
Sep 4

Beyond Straightness: Non-Crossing Flow Matching via Quantile AlignTree Coupling

The paper introduces Quantile AlignTree Flow Matching (QAT‑FM), a structured coupling method that builds a hierarchical, quantile‑aligned tree to connect a Gaussian prior with a target distribution. QAT‑FM achieves efficient coupling construction in ≠ Nd log N time and allows per‑pair source sampling in ≠ d time, enabling scalable training for high‑dimensional generative tasks. The authors prove that the coupling preserves marginal consistency, produces non‑crossing interpolation paths, and improves path separation compared to independent coupling, while also extending naturally to conditional generation.

By Junyi Lin, Mengyu Li, Jingxuan Hu, Kejun He, Cheng Meng